Caves are mysterious areas which depict the lifestyle of ancient times through paintings and carvings on the walls. These ...

Engineer Guillermo D. Christy collects water samples while sitting next to a steel pillar filled with concrete, installed to support a part of the Maya Train track, inside the Aktun Tuyul cave ...

In other caverns, the concrete filling the pillars has spilled out to coat the limestone ground. Water showed traces of iron pollution by rust coming from the metal.

AKTUN TUYUL CAVE SYSTEM, Mexico -- Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

Engineer Guillermo D. Christy photographs a steel pillar filled with concrete that was installed inside the Aktun Tuyul cave system to support the Maya Train track on the outskirts of Playa del ...

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

Aktun Tuyul Cave System, MEXICO (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of… ...